cms/corbaservices/CorbaServices.java

//---PACKAGE DECLARATION---
package uk.ac.ukc.iscream.corbaservices;

//---IMPORTS---
import java.lang.reflect.*;
import java.util.*;
import java.io.*;
import java.net.*;

/**
 * CORBA Services Manager
 *
 * This class provides a simple wrapper to CORBA services
 * that require a web service to "share" their IOR files.
 * This provides an all-in-one way of starting up service(s)
 * and serving their IOR files. No external web servers are
 * required.
 *
 * @author  $Author: tdb1 $
 * @version $Id: CorbaServices.java,v 1.3 2001/02/26 22:13:39 tdb1 Exp $
 */
class CorbaServices {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public static final String REVISION = "$Revision: 1.3 $";
    
    /**
     * Default path to "ok URL's" list
     */
    public static final String DEFAULTOKURLS = "./etc/okUrls.conf";
    
    /**
     * Default path to services list
     */
    public static final String DEFAULTSERVICESCONF = "./etc/services.conf";
    
    /**
     * Default path to web directory. Note there is *no* trailing slash.
     */
    public static final String DEFAULTWEBDIR = "./web";
    
    /**
     * Default port number
     */
    public static final int DEFAULTPORT = 8080;
    
//---STATIC METHODS---
    
    /**
     * This main method starts the whole system up. A lot
     * of the functionality is provided in this main class.
     */
    public static void main(String args[]) {
        
        // Use JacORB
        System.setProperty("org.omg.CORBA.ORBClass","jacorb.orb.ORB");
        System.setProperty("org.omg.CORBA.ORBSingletonClass","jacorb.orb.ORBSingleton");
        
        System.out.println("---  i-scream CORBA Services Manager  ---");
        System.out.println("---          Starting System          ---");
        
        // Read command line arguments
        String okUrls = DEFAULTOKURLS;
        String servicesConf = DEFAULTSERVICESCONF;
        String webDir = DEFAULTWEBDIR;
        int port = DEFAULTPORT;
        for(int i=0; i < args.length; i++) {
            if(args[i].equals("-h")) {
                usage();
            }
            else if(args[i].equals("-u")) {
                i++; okUrls = args[i];
            }
            else if(args[i].equals("-s")) {
                i++; servicesConf = args[i];
            }
            else if(args[i].equals("-w")) {
                i++; webDir = args[i];
            }
            else if(args[i].equals("-p")) {
                i++; port = Integer.parseInt(args[i]);
            }
            else {
                usage();
            }
        }
        
        // Read in the services configuration
        System.out.println("---       Reading Configuration       ---");
        
        LinkedList serviceList = getServicesList(servicesConf);
        String[] svcList = new String[serviceList.size()];
        LinkedList[] svcListParams = new LinkedList[serviceList.size()];
        Iterator i = serviceList.iterator();
        int j=0;
        while(i.hasNext()) {
            StringTokenizer st = new StringTokenizer((String)i.next());
            svcList[j] = (String) st.nextToken();
            LinkedList l = new LinkedList();
            while (st.hasMoreTokens()) {
                l.add(st.nextToken());
            }
            svcListParams[j] = l;
            j++;
        }
        
        // Start the services one by one
        System.out.println("---      Starting CORBA Services      ---");
        
        try {
            
            // get hooks on the system loaders
            Runtime myRuntime = Runtime.getRuntime();
            ClassLoader myClassLoader = ClassLoader.getSystemClassLoader();
            
            // start each service one by one
            for (int k=0; k < svcList.length; k++) {
                
                // Load the class
                Class myClass = myClassLoader.loadClass(svcList[k]);
                // Sort out the command line parameters
                String[] passedArgs = new String[svcListParams[k].size()];
                // keep a String list for printing out later :)
                String arglist = "";
                i = svcListParams[k].iterator();
                int p = 0;
                while(i.hasNext()) {
                    passedArgs[p] = (String) i.next();
                    arglist += " " + passedArgs[p];
                    p++;
                }
                                                        
                // create an array of classes that are listed in the main method header
                // so we can get a hook to the main method
                Class[] passedArgsClass = {passedArgs.getClass()};
                // get a hook on the main method
                Method myMethod = myClass.getMethod("main",passedArgsClass);
                
                // Now we know where it is, we need to create a thread for it, passing in 
                // a list of objects that represent its args.
                Object[] passedArgsObject = {passedArgs};               
                ServiceThread aSvc = new ServiceThread(myMethod, passedArgsObject);
    
                // Finally we start it going
                aSvc.start();
                System.out.println(svcList[k]+arglist);        
            }
        
        } catch (Exception e) {
            System.out.println(e);
            e.printStackTrace();
        }
        
        System.out.println("---      Starting Mini WebServer      ---");
        
        // print out some system details
        String host;
        try {
            host = InetAddress.getLocalHost().getHostName();
        } catch(UnknownHostException e) {
            host = "<unknown>";
        }
        System.out.println("Host:\t\t"+host);
        System.out.println("Port:\t\t"+port);
        System.out.println("URL List File:\t"+okUrls);
        System.out.println("Web Directory:\t"+webDir);
        
        // start the mini-webserver
        MiniWebServer mws = new MiniWebServer(port, okUrls, webDir);
        mws.start();

        System.out.println("---   i-scream CORBA Services Ready   ---");
    }
    
    /**
     * Print out usage information.
     */
    private static void usage() {
        System.out.println("USAGE: java uk.ac.ukc.iscream.corbaservices.CorbaServices <option>");
        System.out.println("   or: java -jar iscream-corbaservices.jar <option>");
        System.out.println("WHERE <option>:");
        System.out.println("      -u <filename> - the location of okUrls config file");
        System.out.println("                      the default is ./etc/okUrls.conf");
        System.out.println("      -s <filename> - the location of services config file");
        System.out.println("                      the default is ./etc/services.conf");
        System.out.println("      -w <dir>      - the location of the web directory");
        System.out.println("                      the default is ./web  (no trailing /)");
        System.out.println("      -p <port>     - this port to bind the webserver to");
        System.out.println("                      the default is 8080");
        System.out.println("      -h            - this help screen");
        System.exit(1);
    }
    
    /**
     * Read the services into a LinkedList. This is later
     * parsed to get classes and parameters.
     *
     * @param filename the services configuration file
     * @return a LinkedList of services
     */
    private static LinkedList getServicesList(String filename) {
        File file = new File(filename);
        LinkedList svcList = new LinkedList();
        if(file.exists() && file.canRead()) {
            // if we can read the file, do so into svcList
            try {
                BufferedReader reader = new BufferedReader(new FileReader(file));
                while(reader.ready()) {
                    String line = reader.readLine();
                    // ignore comments
                    if(!line.startsWith("#")) {
                        svcList.add(line);
                    }
                }
            } catch(IOException e) {
                System.out.println(e);
                e.printStackTrace();
            }
        }
        return svcList;
    }

//---CONSTRUCTORS---

//---PUBLIC METHODS---

//---PRIVATE METHODS---

//---ACCESSOR/MUTATOR METHODS---

//---ATTRIBUTES---

//---STATIC ATTRIBUTES---

//---INNER CLASSES---
    
    /**
     * Inner class to provide a thread for running a Service.
     */
    private static class ServiceThread extends Thread {
     
        // The constructor takes the name of the method we're gonna run
        // and the arguments we're gonna pass into it
        ServiceThread(Method mainMethod, Object[] args) {
            _mainMethod = mainMethod;
            _args = args;
        }
        
        // The main bit of the thread just starts the functionality of the given 
        // method running
        public void run() {
            try {
                _mainMethod.invoke(null, _args);
            } catch (Exception e){
                System.out.println(e);
                e.printStackTrace();
            }
        }
        
        Method _mainMethod = null;
        Object[] _args = null;
    }

}
Revision:	1.4
Committed:	Mon Feb 26 22:26:10 2001 UTC (23 years, 2 months ago) by tdb
Branch:	MAIN
Changes since 1.3:	+62 -20 lines
Log Message:	Commenting and javadoc'ing.
#	Content
1	//---PACKAGE DECLARATION---
2	package uk.ac.ukc.iscream.corbaservices;
3
4	//---IMPORTS---
5	import java.lang.reflect.*;
6	import java.util.*;
7	import java.io.*;
8	import java.net.*;
9
10	/**
11	* CORBA Services Manager
12	*
13	* This class provides a simple wrapper to CORBA services
14	* that require a web service to "share" their IOR files.
15	* This provides an all-in-one way of starting up service(s)
16	* and serving their IOR files. No external web servers are
17	* required.
18	*
19	* @author $Author: tdb1 $
20	* @version $Id: CorbaServices.java,v 1.3 2001/02/26 22:13:39 tdb1 Exp $
21	*/
22	class CorbaServices {
23
24	//---FINAL ATTRIBUTES---
25
26	/**
27	* The current CVS revision of this class
28	*/
29	public static final String REVISION = "$Revision: 1.3 $";
30
31	/**
32	* Default path to "ok URL's" list
33	*/
34	public static final String DEFAULTOKURLS = "./etc/okUrls.conf";
35
36	/**
37	* Default path to services list
38	*/
39	public static final String DEFAULTSERVICESCONF = "./etc/services.conf";
40
41	/**
42	* Default path to web directory. Note there is no trailing slash.
43	*/
44	public static final String DEFAULTWEBDIR = "./web";
45
46	/**
47	* Default port number
48	*/
49	public static final int DEFAULTPORT = 8080;
50
51	//---STATIC METHODS---
52
53	/**
54	* This main method starts the whole system up. A lot
55	* of the functionality is provided in this main class.
56	*/
57	public static void main(String args[]) {
58
59	// Use JacORB
60	System.setProperty("org.omg.CORBA.ORBClass","jacorb.orb.ORB");
61	System.setProperty("org.omg.CORBA.ORBSingletonClass","jacorb.orb.ORBSingleton");
62
63	System.out.println("--- i-scream CORBA Services Manager ---");
64	System.out.println("--- Starting System ---");
65
66	// Read command line arguments
67	String okUrls = DEFAULTOKURLS;
68	String servicesConf = DEFAULTSERVICESCONF;
69	String webDir = DEFAULTWEBDIR;
70	int port = DEFAULTPORT;
71	for(int i=0; i < args.length; i++) {
72	if(args[i].equals("-h")) {
73	usage();
74	}
75	else if(args[i].equals("-u")) {
76	i++; okUrls = args[i];
77	}
78	else if(args[i].equals("-s")) {
79	i++; servicesConf = args[i];
80	}
81	else if(args[i].equals("-w")) {
82	i++; webDir = args[i];
83	}
84	else if(args[i].equals("-p")) {
85	i++; port = Integer.parseInt(args[i]);
86	}
87	else {
88	usage();
89	}
90	}
91
92	// Read in the services configuration
93	System.out.println("--- Reading Configuration ---");
94
95	LinkedList serviceList = getServicesList(servicesConf);
96	String[] svcList = new String[serviceList.size()];
97	LinkedList[] svcListParams = new LinkedList[serviceList.size()];
98	Iterator i = serviceList.iterator();
99	int j=0;
100	while(i.hasNext()) {
101	StringTokenizer st = new StringTokenizer((String)i.next());
102	svcList[j] = (String) st.nextToken();
103	LinkedList l = new LinkedList();
104	while (st.hasMoreTokens()) {
105	l.add(st.nextToken());
106	}
107	svcListParams[j] = l;
108	j++;
109	}
110
111	// Start the services one by one
112	System.out.println("--- Starting CORBA Services ---");
113
114	try {
115
116	// get hooks on the system loaders
117	Runtime myRuntime = Runtime.getRuntime();
118	ClassLoader myClassLoader = ClassLoader.getSystemClassLoader();
119
120	// start each service one by one
121	for (int k=0; k < svcList.length; k++) {
122
123	// Load the class
124	Class myClass = myClassLoader.loadClass(svcList[k]);
125	// Sort out the command line parameters
126	String[] passedArgs = new String[svcListParams[k].size()];
127	// keep a String list for printing out later :)
128	String arglist = "";
129	i = svcListParams[k].iterator();
130	int p = 0;
131	while(i.hasNext()) {
132	passedArgs[p] = (String) i.next();
133	arglist += " " + passedArgs[p];
134	p++;
135	}
136
137	// create an array of classes that are listed in the main method header
138	// so we can get a hook to the main method
139	Class[] passedArgsClass = {passedArgs.getClass()};
140	// get a hook on the main method
141	Method myMethod = myClass.getMethod("main",passedArgsClass);
142
143	// Now we know where it is, we need to create a thread for it, passing in
144	// a list of objects that represent its args.
145	Object[] passedArgsObject = {passedArgs};
146	ServiceThread aSvc = new ServiceThread(myMethod, passedArgsObject);
147
148	// Finally we start it going
149	aSvc.start();
150	System.out.println(svcList[k]+arglist);
151	}
152
153	} catch (Exception e) {
154	System.out.println(e);
155	e.printStackTrace();
156	}
157
158	System.out.println("--- Starting Mini WebServer ---");
159
160	// print out some system details
161	String host;
162	try {
163	host = InetAddress.getLocalHost().getHostName();
164	} catch(UnknownHostException e) {
165	host = "<unknown>";
166	}
167	System.out.println("Host:\t\t"+host);
168	System.out.println("Port:\t\t"+port);
169	System.out.println("URL List File:\t"+okUrls);
170	System.out.println("Web Directory:\t"+webDir);
171
172	// start the mini-webserver
173	MiniWebServer mws = new MiniWebServer(port, okUrls, webDir);
174	mws.start();
175
176	System.out.println("--- i-scream CORBA Services Ready ---");
177	}
178
179	/**
180	* Print out usage information.
181	*/
182	private static void usage() {
183	System.out.println("USAGE: java uk.ac.ukc.iscream.corbaservices.CorbaServices <option>");
184	System.out.println(" or: java -jar iscream-corbaservices.jar <option>");
185	System.out.println("WHERE <option>:");
186	System.out.println(" -u <filename> - the location of okUrls config file");
187	System.out.println(" the default is ./etc/okUrls.conf");
188	System.out.println(" -s <filename> - the location of services config file");
189	System.out.println(" the default is ./etc/services.conf");
190	System.out.println(" -w <dir> - the location of the web directory");
191	System.out.println(" the default is ./web (no trailing /)");
192	System.out.println(" -p <port> - this port to bind the webserver to");
193	System.out.println(" the default is 8080");
194	System.out.println(" -h - this help screen");
195	System.exit(1);
196	}
197
198	/**
199	* Read the services into a LinkedList. This is later
200	* parsed to get classes and parameters.
201	*
202	* @param filename the services configuration file
203	* @return a LinkedList of services
204	*/
205	private static LinkedList getServicesList(String filename) {
206	File file = new File(filename);
207	LinkedList svcList = new LinkedList();
208	if(file.exists() && file.canRead()) {
209	// if we can read the file, do so into svcList
210	try {
211	BufferedReader reader = new BufferedReader(new FileReader(file));
212	while(reader.ready()) {
213	String line = reader.readLine();
214	// ignore comments
215	if(!line.startsWith("#")) {
216	svcList.add(line);
217	}
218	}
219	} catch(IOException e) {
220	System.out.println(e);
221	e.printStackTrace();
222	}
223	}
224	return svcList;
225	}
226
227	//---CONSTRUCTORS---
228
229	//---PUBLIC METHODS---
230
231	//---PRIVATE METHODS---
232
233	//---ACCESSOR/MUTATOR METHODS---
234
235	//---ATTRIBUTES---
236
237	//---STATIC ATTRIBUTES---
238
239	//---INNER CLASSES---
240
241	/**
242	* Inner class to provide a thread for running a Service.
243	*/
244	private static class ServiceThread extends Thread {
245
246	// The constructor takes the name of the method we're gonna run
247	// and the arguments we're gonna pass into it
248	ServiceThread(Method mainMethod, Object[] args) {
249	_mainMethod = mainMethod;
250	_args = args;
251	}
252
253	// The main bit of the thread just starts the functionality of the given
254	// method running
255	public void run() {
256	try {
257	_mainMethod.invoke(null, _args);
258	} catch (Exception e){
259	System.out.println(e);
260	e.printStackTrace();
261	}
262	}
263
264	Method _mainMethod = null;
265	Object[] _args = null;
266	}
267
268	}